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. 2017 Jul 21;8:1378. doi: 10.3389/fmicb.2017.01378

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Copyright © 2017 Li, Cui, Yang, Cui, Wei, Wu, Wang and Zhou.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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XRD pattern (A) and FTIR spectra (B) of JDF1 scratched from the outermost yellowish surface of inactive hydrothermal chimney, indicating that subsamples JDF1 mainly consist of amorphous mineral assemblages. The faint secondary peak at 2𝜃 of 61° and weak absorption peak at ∼1399 cm^-1 indicate the presence of poor crystalline two-line ferrihydrites. In (A), Ba: barite; S: sulfur; Py: pyrite; Mar: marcasite.